diff --git a/Generators/Hydjet_i/CMakeLists.txt b/Generators/Hydjet_i/CMakeLists.txt
index 57ddeb1bf9ee5b98451a94f98624fe959408eeb0..af738683de9fc4afbc49d97cedba7e5c55ec3f57 100644
--- a/Generators/Hydjet_i/CMakeLists.txt
+++ b/Generators/Hydjet_i/CMakeLists.txt
@@ -10,6 +10,7 @@ atlas_depends_on_subdirs(
    PUBLIC
    Generators/GeneratorFortranCommon
    Generators/GeneratorModules
+   Control/CxxUtils
    PRIVATE
    Control/AthenaKernel
    Control/StoreGate
diff --git a/Generators/Hydjet_i/Hydjet_i/HyiPar.h b/Generators/Hydjet_i/Hydjet_i/HyiPar.h
index 54e9dc5c217e699e9419c56024f9f250a653def9..8afb8f87e12edc38d60b028c2d1370e681f53596 100644
--- a/Generators/Hydjet_i/Hydjet_i/HyiPar.h
+++ b/Generators/Hydjet_i/Hydjet_i/HyiPar.h
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
 */
 
 //
@@ -10,6 +10,8 @@
 #ifndef HyiPar_h
 #define HyiPar_h
 
+#include "CxxUtils/unused.h"
+
 extern "C" { void* hyipar_address_(void); }
 
 class HyiPar {
@@ -51,8 +53,8 @@ private:
       int         ipr;
     };
 
-    int m_dummy;
-    float m_realdummy;
+    int ATH_UNUSED_MEMBER(m_dummy);
+    float ATH_UNUSED_MEMBER(m_realdummy);
     static HYIPAR* s_hyipar;
 };